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Posted: 10/13/2004 11:57:59 AM EDT
Link Posted: 10/13/2004 12:07:49 PM EDT
Depends on which pin you mean.
Link Posted: 10/13/2004 12:08:29 PM EDT
Link Posted: 10/13/2004 12:09:19 PM EDT
Yes, you're correct. "Small hole receivers of .250" are the "milspec", but during early production by Colt for the civilian market, they produced rifles utilizing a .315" spec, so as to preclude use of military uppers on civilian lowers. This production lasted until roughly 1993-1994. As a general rule of thumb all Colt "unblocked" lower receivers, are large hole, while pre-ban "blocked" lower receivers represent transition years where occasional variations popped up.
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